Mascara brush



FIG. 1 is a detailed view of the mascara brush, showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a perspective view thereof;

FIG. 5 is a lateral view (right side) thereof; and,

FIG. 6 is a lateral view (left side) thereof. 

The ornamental design for a mascara brush, as shown and described. 